TW201615120A - Fastener element, fastener stringer, and slide fastener - Google Patents

Abstract

This fastener element (20, 20a, 50, 50a) comprises a central land part (21, 51) and first and second bulging parts (22, 52; 23, 23a, 53, 53a) which bulge from the central land part (21, 51) toward the tape obverse side and the tape reverse side in the element thickness direction. The first and second bulging parts (22, 52; 23, 23a, 53, 53a) each comprise a bulging end face (24, 54) which faces the element thickness direction. The bulging end face (24, 54) comprises a quadrilateral base end face (24a, 54a) which is long in the element length direction and a taper-shaped protrusion end face (24b, 54b) which protrudes from the base end face (24a, 54a) in the element width direction. Thus, it is possible to make the fastener element (20, 20a, 50, 50a) look like a single-sided metal element, and to make a slide fastener (1) which is formed using the fastener elements (20, 20a, 50, 50a) lighter in weight than a conventional slide fastener having single-sided metal elements.

Description

Zipper chain, chain and zipper

The present invention relates to a chain belt in which a plurality of synthetic resin fastener elements are arranged by injection molding at the side edges of the chain fabric of the fastener chain cloth, and in particular, the fastener elements of the synthetic resin are made of metal. The zipper-like chain of the zipper.

Conventionally, as a fastener element for a slide fastener, a synthetic resin fastener element having a single synthetic resin formed by injection molding a synthetic resin onto a fastener chain cloth is known, and the monofilament is formed into a coil shape or a zipper element having a continuous zigzag shape and a metal zipper element formed by pressing a sprocket material made of a substantially Y-shaped metal to the fastener chain cloth (hereinafter, abbreviated as metal) Chain teeth) and so on.

In addition, as a metal sprocket, a so-called single-sided metal sprocket described in Japanese Laid-Open Patent Publication No. 2003-299509 (Patent Document 1), or Japanese Patent Laid-Open Publication No. 2009-34495 ( The so-called double-sided metal fastener element described in Patent Document 2).

As shown in FIG. 19, the single-sided metal element 70 described in Patent Document 1 has an engaging head portion 70a formed by press working or the like, a main body portion 70b extending from the engaging head portion 70a, and the main body portion 70b. Branching into a fork extends one of the pair of legs 70c. Further, an engaging convex portion 70d is provided on one surface (front surface) of the engaging head portion 70a, and an engaging concave portion (not shown) is provided on the other surface (rear surface) of the engaging head portion 70a.

Such a single-sided metal sprocket 70 is manufactured by laminating a long wire (Y strip) having a Y-shaped cross section by a multi-stage rolling process at a desired thickness in the longitudinal direction thereof. Making a Y-shaped sprocket raw material, which is equivalent to the obtained sprocket raw material The portion of the engaging head portion 70a is locally pressed and deformed by press working or the like to form the engaging convex portion 70d and the engaging concave portion.

Then, the manufactured single-sided metal sprocket 70 is inserted in the direction in which the leg portions 70c approach each other (inside) in a state where the side edge portion of the fastener fabric of the fastener stringer 71 is inserted between the pair of leg portions 70c. The plastic deformation is thereby attached to the fastener chain 71.

Further, when the single-sided metal element 70 attached to the fastener stringer 71 is viewed from the front and the rear of the chain cloth, the single-sided metal element 70 has the following appearance, that is, the base portion 72 having a rectangular shape, and The front end portion (the end portion on the side of the engaging head portion 70a) of the base portion 72 has a protruding portion 73 which protrudes in a triangular shape toward one of the longitudinal directions of the chain.

On the other hand, as shown in FIG. 20 and FIG. 21, the double-sided metal element 80 described in Patent Document 2 has an engaging head portion 80a, a main body portion 80b extending from the engaging head portion 80a, and a branch from the main body portion 80b. One of the pair of legs 80c is extended by a fork. Further, on one of the front surface (front surface) and the other surface (rear surface) of the engaging head portion 80a, an engaging convex portion and an engaging concave portion are respectively formed, and the engaging head portion 80a is in the thickness direction of the sprocket (slider sliding The direction has a symmetrical shape.

In the state in which the side edge portion of the fastener fabric of the fastener stringer 81 is inserted between the pair of leg portions 80c, the double-sided metal fastener element 80 of the patent document 2 is pressed toward the direction in which the leg portions 80c approach each other (inside). The plastic deformation is thereby attached to the fastener chain cloth 81.

Here, for example, in the zipper having two sliders, when the slider is slid forward or backward with respect to the element row, for example, the single-sided metal element 70 as in the above-mentioned Patent Document 1 is formed into a sprocket row. In the case where the slidability of the sliders between the two sliders is different, when the double-sided metal sprocket 80 as in the above-mentioned Patent Document 2 is formed as a fastener element row, two sliders between the sliders can be prevented. The operability makes a difference.

In addition, in general, the synthetic resin zipper fastener is directly fixed to the fastener chain by injection molding, so that the fastener element is increased relative to the zipper by enlarging the fixed area of the fastener element with respect to the fastener chain cloth. The fixed strength of the chain cloth. Therefore, in the previous In the fastener element made of resin, in order to stably ensure the fixing strength of the fastener element, the sprocket width dimension of each fastener element is set to be large.

On the other hand, the metal sprocket (single-sided and double-sided metal sprocket) is in a state in which the side edges of the fastener fabric are inserted between the pair of leg portions, and the legs are brought closer to each other. (Inner side) is extruded and plastically deformed, thereby being attached to the fastener chain cloth. Further, the metal sprocket has toughness compared to a fastener element made of a synthetic resin. Therefore, even if the metal element is not set to have a large sprocket width dimension, for example, a fastener element made of synthetic resin, sufficient fixing strength can be easily obtained.

Therefore, the metal sprocket can be made smaller than the zipper element made of synthetic resin, and the sprocket can be made thinner, so that the zipper with the metal sprocket is attached (the zipper is mounted). ) Looks stylish or gives a beautiful impression, which improves the appearance of the look. On the other hand, the metal fastener element is heavier than the synthetic resin zipper element, and therefore there is a disadvantage that the weight of the zipper-attached product is large.

Therefore, in the pamphlet of International Publication No. 2013/051149 (Patent Document 3), a fastener element made of synthetic resin is described as an advantage of having both the advantages of the prior metal fastener elements and the fastener elements of the synthetic resin. The zipper element is lighter than the metal element and has a thinner appearance like a metal element (double-sided metal element).

As shown in FIG. 22 and FIG. 23, the synthetic resin fastener zipper 90 described in Patent Document 3 has a central boss portion 91 disposed at a central portion in the thickness direction of the sprocket, and a sprocket from the center boss portion 91. The first bulging portion 92 that bulges on the front side of the chain fabric in the thickness direction and the second bulging portion 93 that bulges from the center boss portion 91 toward the back side of the chain in the thickness direction of the sprocket.

The center boss portion 91 includes a main body portion 91a fixed to the fastener stringer 98, a neck portion 91b extending from the main body portion 91a toward the outer side of the fastener element in the longitudinal direction of the fastener element, and further from the neck portion 91b in the longitudinal direction of the fastener element. An elliptical meshing engaging head portion 91c, a shoulder portion 91d extending from the neck portion 91b in the sprocket width direction, and a fin portion 91e extending from the main body portion 91a toward the inner side of the chain fabric.

Further, the first bulging portion 92 and the second bulging portion 93 are formed in a non-symmetric manner centering on the reference surface of the fastener chain 98 at the center in the thickness direction of the chain fabric. In this case, the first bulging portion 92 has an inclined end surface 95 before and after the end surface 94 in the thickness direction of the sprocket and the side edge from the upper end surface 94 are inclined downward toward the center boss portion 91.

Further, the first bulging portion 92 has a base portion 96 which is disposed on the main body portion 91a of the center boss portion 91, and an extension portion 97 which extends from the base portion 96 to the outside of the chain cloth, from the upper surface side. When the entire first bulging portion 92 is observed, the sprocket shape in which the sprocket width dimension gradually decreases toward the end portion of the extension portion 97 is provided.

The fastener element 90 of Patent Document 3 having such a shape is formed of a synthetic resin, and thus is lighter than a metal fastener zipper. Further, the fastener element 90 is secured to the fastener base 98 at the main body portion 91a of the center boss portion 91.

At the same time, the fastener element 90 is formed by the first and second bulging portions 92 and 93 so as to be thinner than the conventional synthetic resin zipper fastener, thereby providing a double-sided chain such as metal. Tooth-like appearance (beautiful).

Therefore, the zipper to which the fastener element 90 of Patent Document 3 is attached to the zipper chain cloth 98 looks fashionable or gives a beautiful impression as a zipper having a double-sided metal sprocket, and has a double-sided metal sprocket. The zipper is significantly lighter than the zipper.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2003-299509

Patent Document 2: Japanese Patent Laid-Open Publication No. 2009-34495

Patent Document 3: International Publication No. 2013/051149

The fastener element 90 made of synthetic resin described in Patent Document 3 has the above-described configuration and can secure the fixing strength with respect to the fastener stringer 98. Moreover, the synthetic resin is pulled The chain sprocket 90 has an appearance like a double-sided metal sprocket, and the zipper can be made lighter than the double-sided metal sprocket.

In addition, in the prior metal chain teeth, in addition to the double-sided metal sprocket 80 as shown in FIGS. 20 and 21, the shape shown in FIG. 19 is used more than the double-sided metal sprocket 80. Single-sided metal sprocket 70. In recent years, in various articles, especially in daily necessities such as clothing, bags, and footwear, the zipper attached thereto is also regarded as one of the elements of design. For the zipper fasteners for zippers, according to the products of the zipper. There are also cases where the shape of the single-sided metal sprocket is preferred rather than the shape of the double-sided metal sprocket.

However, in the same manner as the double-sided metal sprocket, the conventional single-sided metal sprocket can make the appearance of the sprocket appear thinner than the zipper element made of synthetic resin, but has the disadvantage of making the weight of the zipper heavy. Therefore, it has been demanded to develop a fastener element made of synthetic resin which has a fixing strength with respect to the fastener chain and has a single-sided metal element as a single-sided metal element.

Further, in the single-sided metal fastener element, the shape of one side surface (front surface side) and the other surface side (rear surface side) in the longitudinal direction of the meshing head are different from each other, so that the single-sided metal chain is used. When the tooth is used for a zipper having, for example, two sliders, as described above, there is a problem unique to the single-sided metal sprocket which causes a difference in operability between the two sliders. Therefore, in the development of a zipper element made of synthetic resin having a single-sided metal sprocket-like appearance, it is required to simultaneously solve the problem unique to the single-sided metal sprocket.

The present invention has been made in view of the above-mentioned prior problems, and a specific object thereof is to provide a fastener element, and a chain belt and a zipper for fixing the plurality of fastener elements to the fastener chain cloth, the fastener element is relatively simple. The metal sprocket is lightweight and has an appearance close to that of a single-sided metal sprocket. Further, when used for a zipper having two sliders, the operability of the two sliders is not generated. difference.

In order to achieve the above object, the fastener element provided by the present invention is a synthetic fastener zipper fastener element which is formed on the side edge portion of the fastener fabric of the fastener chain cloth and has a fixing fastener. a central boss portion on the fastener stringer, and first and second bulging portions that bulge from the center boss portion toward the front side of the chain in the thickness direction of the fastener element and the back side of the chain cloth, and the center boss portion a main body portion having a specific size in the direction of the sprocket width and fixed to the fastener zipper, a neck portion extending from the main body portion toward the outer side of the sprocket longitudinal direction chain, and a chain extending from the neck portion An engaging head that extends in the longitudinal direction of the tooth; the most important feature of the fastener element is that the first and second bulging portions respectively have a bulging end surface that faces upward or downward in a thickness direction of the sprocket, and the drum a front pair of side wall faces formed by the rear side edge before the end face to the central boss portion, and the bulging end face has a base end face having a rectangular shape which is long in the longitudinal direction of the sprocket, and the base end face of the quadrangular shape is a front end edge of the engaging head portion, a base end edge of the main body portion side, and a pair of both ends of the front end edge and the base end edge are connected to the side edge as four sides; and a protruding end face From the above substrate Only a part of the one side edge of the pair of side edges before and after the surface protrudes in the sprocket width direction; the protruding end surface is formed in the engaging head portion and has a shape which tapers toward the front end in a direction protruding from the base end surface .

In the fastener element of the present invention, preferably, the end surface of the base has a trapezoidal shape, and the shape of the trapezoid is such that the front end edge is an upper bottom, and the base end edge is a lower bottom, and the pair of the side edges are used as a The side edges are formed, and the lower bottom is formed to be longer than the upper base. In this case, it is preferable that the length of the lower base is set to 1.2 times or less the length of the upper base, and it is preferable that the pair of the side edges before and after the base end surface are formed to be curved inwardly in a concave shape. curve.

Further, in the fastener element of the present invention, it is preferable that the protruding end surface is inclined downward from the base end surface in the sprocket width direction. Further, it is preferable that the base end surface has an inclined surface that is inclined downward in the longitudinal direction of the sprocket toward the front end edge.

Further, it is preferable that the base end surface is disposed only in a region of the sprocket width direction that is located inside the neck portion of the center boss portion.

Further, in the fastener element of the present invention, it is preferable that the protruding end surface is formed into a flat surface. The curved surface of the ridge is formed so that at least the protruding end surface of the side wall surface is inclined downward toward the center boss portion via a portion corresponding to the base end surface via the base end surface, and is formed as a curved surface of the concave strip.

Further, in the fastener element of the present invention, it is preferable that the central boss portion further has a shoulder extending from the neck portion in the width direction of the sprocket, and a concave portion recessed at an end portion of the engaging head portion. The groove portion is formed in an antisymmetric manner centering on a reference surface of the fastener stringer at the center in the thickness direction of the fastener fabric.

Further, the center boss portion has a first half that is disposed on a front side of the chain fabric from a reference surface that is located at a center in a thickness direction of the fastener fabric, and is disposed on a back surface of the chain fabric than the reference surface. The second half of the side, and the first half and the second half may be arranged at a position shifted from each other in the sprocket width direction.

According to the present invention, there is provided a fastener tape obtained by fixing a plurality of the fastener elements having the above-described configuration to a side edge portion of a fastener fabric of the fastener stringer. Furthermore, according to the present invention, there is provided a slide fastener comprising the above-described pair of fastener tapes and a slider attached to a fastener element row including a plurality of the fastener elements.

The fastener element of the present invention has a central boss portion fixed to the fastener chain cloth, a first bulging portion that bulges from the center boss portion toward the front side of the chain sash thickness direction, and a direction from the center boss portion. The second bulging portion bulged on the back side of the chain cloth in the thickness direction of the sprocket. The central boss portion includes a main body portion having a specific size in the direction of the sprocket width and fixed to the fastener zipper, a neck portion extending from the main body portion toward the outer side of the sprocket longitudinal direction, and a neck portion The engaging head portion is formed to be symmetrical with respect to the center portion of the sprocket width direction in the slider sliding direction (front-rear direction).

Further, the first and second bulging portions of the fastener element have a bulging end surface which is a design surface above or below the sprocket thickness direction, and a side edge from the rear side before the bulging end surface to the center boss portion. A pair of front and rear side wall faces are formed. Further, each of the first and second bulging portions The bulging end surface is provided with a base end surface having a rectangular shape in the longitudinal direction of the sprocket, and a side end of the one of the pair of side edges (front side edge or rear side edge) from the base end surface only engaging the head side a protruding end portion that protrudes toward the width direction of the sprocket.

In this case, the base end surface of the quadrangular shape has the front end edge on the meshing head side, the base end edge on the main body side, and the front side edge and the rear side edge as four sides. Here, the term "quadrilateral" refers to a plane pattern surrounded by four line segments (limited straight lines), and the side also includes a curve instead of a line segment (refer to the publication of "Guang Ci Yuan [Fifth Edition]" by Yanbo Bookstore). Further, the projecting end surface is formed in the engaging head portion of the center boss portion, and has a shape in which the front end tapers in such a manner that the direction from the side edge of the base end surface gradually decreases in the longitudinal direction of the fastener element (for example, a triangle) shape).

In the case of such a fastener element, the lower end surface of the first and second bulging portions on the design surface is the base end surface of the four-sided shape which is long in the longitudinal direction of the sprocket, and the front end faces only from the base end surface. A protruding end surface of a pointed shape (triangular shape) which protrudes from one side is formed. Therefore, for example, when the fastener element is viewed from the front and back sides of the fastener fabric of the fastener chain, it can be seen as a single-sided metal element as shown in FIG. .

Therefore, the zipper is produced by injection molding the sprocket of the synthetic resin into the fastener zipper, and the zipper of the synthetic resin can be obtained, which is lighter than the zipper having the single-sided metal sprocket. A zipper having an appearance close to that of a single-sided metal sprocket.

Further, unlike the conventional single-sided metal sprocket, the fastener element of the present invention has a central boss portion disposed at a central portion in the thickness direction of the sprocket in the sliding direction of the slider centering on the central portion in the sprocket width direction. (front and rear direction) is formed symmetrically. Therefore, when the zipper element of the present invention is applied to a zipper having two sliders (first and second sliders) attached to the element rows in opposite directions, it is also possible to prevent The operability of the sliders between the two sliders is different.

In the zipper element of the present invention, the base end surface of the bulging end surface has a trapezoidal shape, and the trapezoidal shape is formed by the front end edge of the bulging end surface on the engaging head side as the upper bottom. The base end edge on the leg side is used as the lower base, and the pair of front side edges are used as a pair of side edges, and the lower bottom is formed to be longer than the upper base.

For example, when the base end surface of the bulging end face of the fastener element is formed into a rectangular shape, the appearance of the fastener element can be made closer to the single-sided metal element, but it is apparent that the following problems occur.

In other words, when the base end surface is formed into a rectangular shape, the length of the base end surface of the base end surface which is the short side of the rectangular shape is the same as the length of the base end edge of the leg side. Further, in terms of the product characteristics or the formability of the fastener element, the length of the short side of the front end edge of the engaging head portion and the base end side of the leg side cannot be longer than the sprocket width of the neck. In this case, if the length of the front end edge of the engaging head side is lengthened to some extent within the above range (that is, the rectangular shape becomes a wider width), the left and right zippers are used in the zipper formed using the fastener element. When the fastener element is subjected to a lifting force or the like in a meshed state, and a part of the slide fastener is strongly bent in a direction in which the first bulging portions of the fastener element (or the second bulging portion are close to each other), the left and right fastener elements are bent. One end of the first bulging portion (or the second bulging portion) of one of the zipper elements of the row (the end portion on the meshing head side), and the first bulging portion of the other zipper element (or the first 2 bulging) collision and easy to interfere with each other.

Further, if the interference is strong between the left and right fastener elements, there is a case where the portion of the interference becomes a fulcrum and the force in the direction in which the left and right fastener elements are separated from each other is easy to function, and the force is caused by the force. The posture of the zipper chain teeth is inclined in the forward and reverse directions of the chain cloth or the length of the chain cloth. In this case, for example, the fastener element is held between the fastener elements of the meshing object while maintaining the abnormal posture of the tilt, thereby hindering the opening and closing operation of the fastener element by the slider, or the worst case. There is a so-called chain rupture that causes the engagement of the zipper elements to be forcibly separated.

On the other hand, for example, if the length of the front end edge (short side) of the engaging head portion of the base end face is made short so as not to cause a problem of the chain breakage due to the collision of the left and right fastener elements as described above, When the base end surface is formed into a rectangular shape, the base end face legs The length of the base end edge (short side) of the side portion is also shortened in the same manner. In this case, in the slide fastener formed using the fastener element, the interval between the base end portions (end portions on the leg side) of the base end faces of the fastener elements fixed to the fastener tapes adjacent to each other is widened.

Therefore, for example, when the sliders are slid in a state in which the left and right zipper strips are strongly stretched to the outside in the width direction of the chain fabric, and the left and right sprocket rows are engaged, the flange portion of the slider The spacing between the base end portions of the zipper teeth adjacent to each other is widened, and the fastener elements are easily embedded in the chain insertion gap of the slider, so that the sliding member is prevented from sliding in the blocking direction.

With respect to such a defect, by making the base end surface have a trapezoidal shape in which the bottom side of the leg side is longer than the bottom of the meshing head side as described above, for example, the base end surface can be bottomed (the meshing head side is The length of the front end edge is set to a shorter size, and even if a part of the zipper is partially strongly bent by the zipper or the like, the rupture of the chain can be prevented, and the bottom end of the base end surface can be The length of the base end edge of the leg side is set to a long size, and even if the slider is slid in the blocking direction while a strong lateral pulling force is applied to the zipper, the flange portion of the slider can be prevented from entering. (embedded) to the zipper teeth.

Thereby, even if a strong lifting force or a lateral pulling force is applied, the fastener element can be prevented from being held or the chain is broken in a state of maintaining an abnormal posture of the tilt, and the sliding of the slider can be prevented from being inserted into the fastener element. It is hindered, so that a high-quality zipper capable of stably maintaining the zipper function can be stably manufactured. Further, by forming the base end surface into a trapezoidal shape as described above, the sprocket width dimension of the first and second bulging portions can be gradually increased toward the leg side, so that the first and second drums can be stably ensured. The strength of the exit (especially the end of the lower side of the first and second bulging portions).

In particular, in this case, by setting the length of the lower end of the base end surface to 1.2 times or less the length of the upper base, it is possible to ensure the effect of forming the end surface of the base as described above by a trapezoidal shape. The appearance of the zipper teeth of the base end face of the trapezoid is closer to the appearance of the single-sided metal sprocket. Moreover, in this case, the length of the bottom of the base end surface is also Since it is appropriately lengthened to some extent, the strength of the end portion on the bottom side of the first and second bulging portions can be appropriately ensured.

Further, in this case, the pair of side edges of the base end face are formed in a curved shape which is curved inwardly in a concave shape, whereby the end surface of the base of the trapezoid can be made more elongated, so that the appearance of the fastener element can be made closer to the single The appearance of the metal sprocket. Further, in the present invention, the pair of side edges of the base end face may be formed in a straight line shape.

In the fastener element of the present invention, it is preferable that the protruding end surface of the tapered shape is inclined downward from the base end surface in the sprocket width direction, or the quadrangular (especially trapezoidal) base end surface has a front end edge facing the engaging head side. An inclined surface that is inclined downward in the longitudinal direction of the sprocket.

Therefore, in the zipper formed by using the fastener element as described above, a pulling force or the like is applied to the meshing element of the fastener element, and one of the zippers is directed toward the first bulging portion of the fastener element (or When the bulging portions are strongly bent in the direction in which they are approached, it is difficult to make the front end portion of the first bulging portion (or the second bulging portion) of the zipper element of one of the left and right sprocket rows and the other side The front end portions of the first bulging portion (or the second bulging portion) of the fastener elements collide with each other, so that it is possible to more effectively prevent the fastener element from being held in an abnormal posture to maintain the inclination or the chain to be broken.

Further, when the slider is slid in the zipper, the protruding end surface of the tapered shape is inclined downward as described above, or the base end surface of the quadrangular shape has the inclined surface as described above, so that the slider can be aligned with respect to the zipper chain The sliding resistance of the teeth is reduced. Further, for example, when the slider is slid in the blocking direction, even if a lateral pulling force is applied to the fastener stringer, the slider is slightly rotated in the direction in which the slider element is erected with respect to the slider, so that the fastener chain is not easily obtained. The teeth are stuck on the slider. Therefore, the slidability of the slider can be further improved.

Further, in the fastener element of the present invention, the base end surface of the quadrangular shape is disposed only in a region on the inner side of the neck portion of the center boss portion in the width direction of the sprocket, and the size of the sprocket width direction of the base surface is The maximum value is set to be smaller than the minimum size of the sprocket width direction of the neck portion of the center boss portion.

Thereby, the zipper teeth can be made thinner and have a fashionable shape. Further, when the first bulging portion of the fastener element (or the second bulging portion) is partially strongly bent in the zipper, the occurrence of chain rupture can be more effectively prevented.

Further, by arranging the base end faces of the quadrangular shape only in the inner side of the neck portion of the center boss portion, the pair of side wall faces can be formed before the first and second bulging portions. An inclined surface (planar or curved surface) that is inclined downward toward the side of the center boss portion. With this configuration, the draft angle of the fastener element injection molding can be stably provided on the pair of side wall surfaces before and after the first and second bulging portions, so that the mold release at the time of molding can be smoothly performed.

Further, in the fastener element of the present invention, the protruding end surface of the tapered shape is formed as a curved surface of a flat surface or a ridge, and at least the protruding end surface of the side wall surface is disposed on the opposite side with the base end surface interposed therebetween. The portion is inclined downward toward the central boss portion and formed as a curved surface (concave surface) of the concave strip.

When the protruding end face of the tapered shape is formed into a curved surface of a flat surface or a ridge, the base end face of the quadrangular shape is easily seen and the tapered shape is seen when the fastener element is viewed from the front and back sides of the chain fabric. Highlight the end face. At the same time, when the side wall surface disposed on the opposite side of the protruding end surface of the tapered shape is formed into a concave shape and the side wall surface is viewed from the front and back sides of the chain cloth, the side wall surface can be hardly seen, and Since the light reflected by the concave surface is hard to be scattered toward the front and back sides of the chain cloth, a visual effect that the side wall surface becomes a shadow portion and looks dark is obtained. As a result, the zipper teeth are more like a single-sided metal sprocket.

In the zipper element of the present invention, the central boss portion further has a shoulder extending from the neck in the width direction of the sprocket, and a groove portion recessed at an end portion of the engaging head, and the central boss portion It is formed in an antisymmetric manner centering on the reference surface of the fastener chain in the center of the thickness direction of the chain fabric.

By forming the center boss portion in this manner, the left and right fastener elements can be stably engaged when the zipper is formed, and the lateral tension against the width direction of the chain cloth can be appropriately ensured. The strength (transverse tensile strength), or the strength of the jacking force against the forward and reverse directions of the chain cloth (pushing strength).

Further, the fastener element having the center boss portion as described above is excellent in appearance and excellent in appearance quality, and when the slide fastener is formed, the slider can be smoothly slid, and the slider has excellent slidability.

On the other hand, in the fastener element of the present invention, the center boss portion has a first half portion disposed on the front side of the chain cloth at a reference surface of the fastener chain in the center of the thickness direction of the fastener fabric, and is disposed at the center The reference surface is formed on the second half of the back side of the chain fabric, and the first half and the second half are also arranged to be displaced from each other in the sprocket width direction.

By forming the center boss portion in this way, when the zipper is formed, the left and right fastener elements can be stably engaged, and the strength (transverse tensile strength) against the lateral tensile force in the width direction of the chain cloth can be appropriately ensured, Or the strength of the jacking force in the forward and reverse directions of the chain cloth (pushing strength).

Further, the fastener element having the center boss portion as described above has a shape without undercut when the injection molding die is opened in the forward and reverse directions of the chain cloth, so that the injection molding of the fastener element can be easily performed.

Further, according to the present invention, there is provided a fastener tape having a plurality of fastener elements having the above-described configuration fixed to a side edge portion of a fastener fabric of a fastener chain cloth, and further comprising a slide fastener having the pair of fastener tapes and the slider.

According to the zipper of the present invention, each of the fastener elements of the synthetic resin can be made like a single-sided metal sprocket, and can be formed lighter than the zipper having the single-sided metal sprocket. Further, in the zipper of the present invention, unlike the zipper having the single-sided metal sprocket, the two sliders of the first slider and the second slider are attached to the element rows in opposite directions to each other. In the case of the case, it is also possible to prevent the operability of the sliders between the two sliders from being different.

1‧‧‧ zipper

5‧‧‧1st stop

6‧‧‧Separable inserts

7‧‧‧Latch

8‧‧‧ pins

9‧‧‧Opening cylinder

10‧‧‧Chain

11‧‧‧Zipper chain cloth

11a‧‧‧core cord

12‧‧‧Chain row

20‧‧‧zipper teeth

20'‧‧‧zipper teeth

20a‧‧‧zipper teeth

21‧‧‧Central Boss Department

21a‧‧‧ Main body

21b‧‧‧ neck

21c‧‧‧ meshing head

21d‧‧‧Shoulder

21e‧‧‧ Groove

22‧‧‧1st bulging (front side bulging)

23‧‧‧2nd bulging part (back side bulging)

23a‧‧‧2nd bulging part (back side bulging)

24‧‧‧ bulging end face

24a‧‧‧Base end face

24b‧‧‧Outstanding end face

25‧‧‧ front side wall surface

26‧‧‧ Rear side wall

27‧‧‧ front end

28‧‧‧ base end face

30‧‧‧Sliding parts

31‧‧‧Slider body

32‧‧‧ pull-up

33‧‧‧Upper wing

34‧‧‧lower wing

35‧‧‧Guiding column

36‧‧‧Upper flange

37‧‧‧ Lower flange

38‧‧‧ Pull tab mounting post

41‧‧‧Upper

42‧‧‧ bottom

43‧‧‧Side side (legs)

45‧‧‧Based side curved surface

46‧‧‧Main base end face

47‧‧‧ Downward slope

50‧‧‧zipper teeth

50a‧‧‧zipper teeth

51‧‧‧Central Boss Department

52‧‧‧1st bulging (front side bulging)

53‧‧‧2nd bulging part (back side bulging)

53a‧‧‧2nd bulging part (back side bulging)

54‧‧‧ bulging end face

54a‧‧‧Base end face

54b‧‧‧Outstanding end face

61‧‧‧1st half

61a‧‧‧ Main body

61b‧‧‧ neck

61c‧‧‧ meshing head

62‧‧‧2nd half

62a‧‧‧ Main body

62b‧‧‧ neck

62c‧‧‧ meshing head

73‧‧‧ highlight

90‧‧‧zipper teeth

91‧‧‧Central boss

91a‧‧‧ Main body

91b‧‧‧ neck

91c‧‧‧ meshing head

91d‧‧‧Shoulder

91e‧‧‧Fin

92‧‧‧1st bulging department

93‧‧‧2nd bulging department

94‧‧‧Upper end face

95‧‧‧Slanted side

96‧‧‧Base Department

97‧‧‧Exit

98‧‧‧Zipper chain cloth

d‧‧‧Interval between the base ends of the base end faces of adjacent zipper elements

Width of the upper flange portion of t1‧‧‧

T2‧‧‧ width dimension of the lower flange

θ‧‧‧An angle formed by the protruding end face and the front side wall surface

Fig. 1 is a plan view showing a slide fastener having a fastener element of a first embodiment of the present invention.

Fig. 2 is a perspective view showing the fastener element.

Figure 3 is a plan view of the fastener element.

Fig. 4 is a schematic view showing the fastener element when viewed from the meshing head side of the center boss portion in the chain width direction.

Fig. 5 is a schematic view showing the fastener element when viewed from the leg side of the center boss portion in the width direction of the chain.

Fig. 6 is a cross-sectional view showing the front side of the chain fabric of the VI-VI line shown in Fig. 3.

Figure 7 is a cross-sectional view taken along line VII-VII of Figure 4.

Fig. 8 is an enlarged view of an essential part showing a part of the chain belt in an enlarged manner.

Figure 9 is a front view showing the slider for the zipper.

Figure 10 is a cross-sectional view taken along line X-X of Figure 1.

Fig. 11 is a cross-sectional view showing a state in which a zipper in which the left and right fastener elements are engaged is bent in the front and back directions of the chain cloth.

Fig. 12 is a schematic view showing a state in which the fastener element of the modification of the first embodiment is viewed from the meshing head side of the center boss portion in the chain width direction.

Figure 13 is a perspective view showing a fastener element of a second embodiment of the present invention.

Figure 14 is a bottom plan view of the fastener element.

Fig. 15 is a schematic view showing the fastener element when viewed from the meshing head side of the center boss portion in the chain width direction.

Fig. 16 is a schematic view showing the fastener element when viewed from the leg side of the center boss portion in the chain width direction.

Figure 17 is a cross-sectional view taken along line XVII-XVII of Figure 14.

Fig. 18 is a schematic view showing a state in which the fastener elements of the modification of the second embodiment are viewed from the meshing head side of the center boss portion in the chain width direction.

Figure 19 is a plan view showing a prior art chain belt having single-sided metal fastener elements.

Figure 20 is a plan view showing a prior zipper having double-sided metal sprocket.

Fig. 21 is an enlarged cross-sectional view showing a portion of a state in which the double-sided metal sprocket of the zipper is engaged in a cross section.

Fig. 22 is a perspective view showing a conventional fastener tape of a fastener element having a synthetic resin such as a double-sided metal element.

Figure 23 is a plan view of the chain belt.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Further, the present invention is not limited to the embodiments described below, and various modifications can be made as long as they have substantially the same configuration as the present invention and exert the same operational effects.

Example 1

Fig. 1 is a plan view showing a slide fastener having the fastener element of the first embodiment. 2 and 3 are a perspective view and a plan view of the fastener element. Fig. 4 is a schematic view showing the fastener element when viewed from the meshing head side of the center boss portion in the width direction of the chain cloth, and Fig. 5 is a view showing the fastener chain from the leg side of the center boss portion in the width direction of the chain cloth. Pattern diagram of the tooth.

Furthermore, in the following description, the longitudinal direction of the fastener chain of the fastener chain cloth is defined as the front-rear direction, in particular, the direction in which the sliding member slides when the zipper is closed is set to the front, and the direction in which the slider is to be slid when the zipper is opened is opened. Set to the rear. Moreover, the width direction of the fastener fabric of the fastener chain is defined as the left-right direction. Further, the front and back directions of the fastener fabric of the fastener stringer are defined as the vertical direction, and the side of the slider in which the slider is disposed with respect to the fastener stringer is set to the upper side, and the opposite side is set to the lower side.

Further, in order to easily explain the features of the present invention, the longitudinal direction of the fastener is described as the direction of the sprocket width, and the direction of the width of the sprocket is described as the longitudinal direction of the sprocket, and the direction of the chain is described in the forward and reverse directions. It is the direction of the chain tooth thickness.

As shown in FIG. 1, the zipper 1 of the first embodiment has a pair of left and right chain belts 10, and the like. A pair of chain flanks 12 are formed on the opposite side edges of the left and right fastener chains 11; a first stop 5 (also referred to as an upper stop) adjacent to the element rows 12 at the front end of each of the links 10 The detachable insert 6 is disposed at an end portion of the pair of chain belts 10; and the slider 30 is slidably disposed along the element row 12.

Furthermore, the zipper 1 of the first embodiment has the main features in forming the shape of each of the fastener elements 20 of the element row 12, with respect to the zipper chain 11, the first stop 5, the detachable insert 6, And the slider 30 is substantially the same as the conventional zipper of the conventional fastener element made of synthetic resin.

For example, the detachable insert 6 of the first embodiment has a pin 7 disposed at the rear end portion of the chain belt 10 on the left side, a barrel pin 8 disposed at the rear end portion of the chain belt 10 on the right side, and the rear end of the barrel pin 8 The open end barrel 9 is integrally formed, and the separable insert 6 is formed as a separable insert 6 for right insertion.

Further, in the present invention, for example, the positional relationship between the plug 7 and the tubular pin 8 and the open end cylinder 9 is opposite to that of the first embodiment in the left-right direction, the plug 7 is attached to the right side chain belt 10, and the tubular pin is attached. 8 and the tail cylinder 9 are attached to the chain belt 10 on the left side, whereby a detachable insert 6 for left insertion can also be formed.

The slider 30 of the first embodiment has a slider main body 31 and a pull tab 32 having a mounting shaft portion at one end thereof, and the pull tab 32 is rotatably held by the slider main body 31 around the mounting shaft portion. The slider main body 31 has an upper blade 33 and a lower blade 34, a guide post 35 that connects the upper end portions of the upper blade 33 and the lower blade 34, and a left and right side edge portions of the upper blade 33. The upper flange portion 36; the flange portion 37 which is erected on the left and right side edge portions of the upper blade 33; and the tab mounting post 38 provided on the upper surface of the upper blade 33.

At the front end of the slider main body 31, left and right introduction ports are formed so as to be spaced apart from each other by the guide post 35, and an engagement opening is formed at the rear end of the slider main body 31. Further, between the upper blade 33 and the lower blade 34, a substantially Y-shaped sprocket guide path that connects the left and right introduction ports and the engagement port is formed.

Further, between the flange portion 36 and the lower flange portion 37 disposed on the left and right side portions of the slider body 31, a fastener insertion gap through which the fastener tape 11 is inserted is formed. In this case, the width dimension t1 between the inner side surface and the outer side surface of the upper flange portion 36 and the width dimension t2 between the inner side surface and the outer side surface of the lower flange portion 37 are set to be the same size.

In each of the fastener tapes 10 of the first embodiment, the fastener chain fabric 11 is woven or woven into a thin strip shape which is long in the longitudinal direction of the fastener fabric. Each of the fastener chain fabrics 11 has a chain main body portion sewn to a fastener attached product (clothing or bag type), and a chain side edge portion (also referred to as a fastener element mounting portion) formed by the element tooth row 12.

Further, a core cord portion 11a is disposed on the side edges of the links of the left and right fastener chains 11 facing each other. Each of the element rows 12 is formed by fixing a plurality of fastener elements 20 made of synthetic resin to the side edge portions of the fastener fabric 11 including the core cord portion 11a at a fixed interval in the longitudinal direction of the fastener fabric. .

In this case, the fastener element 20, the first stopper 5, and the detachable insert 6 are made of, for example, nylon, polyacetal, polyamine, polypropylene, polybutylene terephthalate, and poly A thermoplastic resin such as a carbonate or a composite material containing a reinforcing fiber such as glass fiber, carbon fiber or aromatic polyamide fiber in the thermoplastic resin is formed by molding the fastener chain 11 .

The fastener element 20 formed using the thermoplastic resin as described above is significantly lighter than the conventional single-sided metal fastener element (metal single-sided fastener element). In particular, the fastener element 20 of the first embodiment is formed by injection molding a material in which a glass fiber is kneaded in a nylon onto the fastener stringer 11, whereby the rigidity of the fastener element 20 can be improved.

Further, in the first embodiment, the metal foil is transferred to the following bulging end surface 24 of the fastener element 20 by transfer printing or the like (the base end surface 24a of the trapezoidal shape and the projecting end surface 24b of the tapered shape). It is also possible to impart a metallic luster to the bulging end face 24 of the zipper element 20 having a shape such as a single-sided metal sprocket.

Each of the fastener element teeth 20 of the first embodiment has a central portion disposed in the thickness direction of the element teeth. The center boss portion 21, the first bulging portion (front side bulging portion) 22 bulging upward from the center boss portion 21, and the second bulging portion bulging downward from the center boss portion 21 ( In the back side bulging portion 23, the first bulging portion 22 and the second bulging portion 23 are formed in a mutually opposing manner with respect to the reference surface of the fastener chain 11 at the center in the thickness direction of the fastener fabric.

In this case, the first bulging portion 22 of the fastener element 20 is exposed on the exposed surface side of the zipper 1 on the outside. Further, the fastener element 20 has a chain from the upper surface of the first bulging portion 22 (the bulging end surface 24 described below) to the lower surface of the second bulging portion 23 (the bulging end surface 24 described below). The sprocket thickness dimension in the opposite direction is set to a specific size corresponding to the size of the interval between the lower flaps 33, 34 on the slider 30.

The center boss portion 21 of the first embodiment has a main body portion 21a fixed to the chain side edge portion of the fastener chain cloth 11, and extends from the main body portion 21a toward the outer side of the chain fabric in the chain width direction (the sprocket length direction). The neck portion 21b, the engaging head portion 21c extending from the neck portion 21b in the width direction of the chain, and the pair of shoulder portions 21d and the concave portion protruding from the neck portion 21b in the longitudinal direction of the chain (the direction of the sprocket width) A groove portion 21e provided at an end portion of the engaging head portion 21c.

The main body portion 21a of the center boss portion 21 is fixed across the front surface of the fastener fabric of the fastener stringer 11 and the back surface of the fastener fabric. In this case, in order to secure the fixing strength with the fastener stringer 11, the area of the portion where the main body portion 21a is fixed to the fastener stringer 11 has, for example, an area which is fixed to the portion of the fastener stringer of the conventional synthetic resin fastener element. Roughly the same size.

Further, when the main body portion 21a of the center boss portion 21 sufficiently obtains the fixing strength with the fastener stringer 11, for example, the element width of the main body portion 21a may be set smaller than the previous element width dimension. Further, the sprocket width dimension of the main body portion 21a may be set larger than the previous sprocket width dimension, as needed.

The neck portion 21b of the center boss portion 21 extends from the side edge of the fastener fabric of the fastener chain 11 to the outside of the chain fabric, and has a contraction in a manner that the dimension in the width direction of the fastener element is smaller than that of the engaging head portion 21c and the main body portion 21a. The shape is such that the engaging head portion 21c of the fastener element 20 of the engaging object can be fitted.

The shoulder portion 21d of the center boss portion 21 extends forward and backward in the direction of the sprocket width from the center portion in the thickness direction of the sprocket of the neck portion 21b. The shoulder portions 21d are formed so as to be fitted into the concave portion 21c formed in the engaging object when the engaging head portion 21c of the fastener element 20 of the engaging object is fitted into the neck portion 21b of the center boss portion 21. In the groove portion 21e.

The engaging head portion 21c of the center boss portion 21 extends from the neck portion 21b to the outside of the chain cloth, and is formed in an elliptical shape that bulges toward the sprocket width direction. At the end portion of the engaging head portion 21c, the groove portion 21e has a size that can be fitted into the shoulder portion 21d of the fastener element 20 of the engaging object, and is formed in the sprocket width direction (the chain length direction).

The center boss portion 21 has the above-described configuration. When the slider 30 is slid and the slide fastener 1 is opened and closed, the left and right fastener elements 20 can be smoothly engaged and disengaged, and the left and right fastener elements can be made. When the 20 is engaged, a sufficient meshing strength which can make the zipper 1 durable can be stably obtained.

Further, since the center boss portion 21 is formed symmetrically with respect to the reference surface located at the center in the direction of the width direction of the sprocket, the appearance is excellent, the appearance quality is excellent, and the sliding of the slider 30 can be smoothly performed. The meshing action or the separating action of the left and right zipper elements 20 is generated, and the sliding property of the slider 30 is also good.

Further, for example, the two sliders of the first slider (the positive slider) and the second slider (the reverse slider) are attached to the element row 12 so that the respective engagement openings face each other to form a zipper. In the case of the zipper having the single-sided metal sprocket, there is no problem that the operability of the slider between the two sliders is different.

As described above, the first bulging portion 22 and the second bulging portion 23 of the fastener element 20 of the first embodiment are opposite to each other with respect to the reference surface of the fastener chain 11 at the center in the thickness direction of the fastener fabric. Formed symmetrically. Therefore, the first bulging portion 22 will be described in detail herein, and the detailed description of the second bulging portion 23 will be omitted.

The first bulging portion 22 of the first embodiment is integrally formed with the first boss portion of the fastener element 20 and the center boss portion 21, and has a three-dimensional shape that bulges upward from the center boss portion 21. Further, the first bulging portion 22 has a bulging end surface 24 which is an upper surface facing upward, a front side wall surface 25 and a rear side wall surface 26 in the sprocket width direction, a front end surface 27 facing the meshing target side, and a zipper chain. The base end face 28 of the inner side of the chain cloth of the cloth 11. Further, the faces 24 to 28 are divided by the ridge portion.

Here, the bulging end surface 24 of the first bulging portion 22 is an end surface having an inclination angle (inclination angle on the inner angle side) with respect to the front surface of the fastener fabric 11 of 45 mm or less. By thus forming the bulging end face 24 at an inclination angle of 45 or less with respect to the front surface of the chain fabric, when the fastener element 20 is viewed from the upper surface side (refer to FIG. 3), the shape or contour of the bulging end surface 24 can be made. clearer. Further, for example, when the metal foil is transferred to the bulging end surface 24 of the fastener element 20 by transfer printing as described above, the foil transfer can be performed beautifully and stably.

When the sprocket end surface 24 of the first bulging portion 22 is viewed from the upper surface side, the base end surface 24a having a trapezoidal shape that is long in the longitudinal direction of the sprocket and the engaging head portion from the base end surface 24a are provided. The end portion of the 21c side protrudes forward into a pointed triangular end surface 24b having a tapered shape. When the synthetic resin fastener element 20 is viewed from the front and back sides of the fastener fabric of the fastener chain 11 by the bulging end surface 24 having such a shape, the first bulging portion 22 and the second bulging portion 23 can be Appears close to the appearance of single-sided metal sprocket.

In particular, in the first embodiment, the base end surface 24a of the trapezoidal shape has an isosceles trapezoidal shape, and the shape of the isosceles trapezoid is such that the front end edge of the engaging head portion 21c side serves as the upper base 41, and the base end edge of the leg side. As the lower base 42, a pair of front and rear side edges are used as a pair of side edges (legs) 43, and the lower bottom 42 is formed to be longer than the upper bottom 41.

Further, in the fastener element 20 of the present invention, the base end surface 24a of the bulging end surface 24 has a quadrangular shape in which four sides of a straight line or a curved line are connected by four vertices when viewed from the front and back directions of the chain cloth. Alternatively, instead of the trapezoidal shape which is long in the longitudinal direction of the sprocket as described above, a rectangular shape having a long length in the longitudinal direction of the sprocket may be present.

In this case, the length of the lower base 42 of the base end surface 24a is set to be longer than the upper base 41. Further, the zipper elements 20 of the same fastener chain 11 which are adjacent to each other in the longitudinal direction of the chain fabric are The interval d between the base end portions (lower bottom end portions) of the base end surface 24a is set larger than the width dimension t1 of the upper flange portion 36 of the slider 30. Further, in the case of the second bulging portion 23, the interval d between the fastener elements 20 is also set larger than the width dimension t2 of the flange portion 37 below the slider 30.

By thus making the length of the bottom portion 42 of the base end surface 24a longer, and making the interval d between the fastener elements 20 smaller, for example, even if a strong lateral tension is applied to the zipper 1, the slider is made. The slide 30 is slid forward (in the blocking direction), and the upper and lower flange portions 36 and 37 of the slider 30 are prevented from entering between the fastener elements 20 and stopped.

Further, in this case, in the base end surface 24a of the first embodiment, the lower bottom 42 is set to have a length of 1.2 times or less the length of the upper base 41, and the pair of front and rear side edges 43 are formed to be curved inwardly to be concave. Curved shape.

Thereby, even if the base end surface 24a is formed in a trapezoidal shape so as to prevent the slider 30 from entering between the fastener elements 20 as described above, the shape of the base end surface 24a can be made close to a rectangular shape and appear to be more elongated. In addition, the base end surface 24a of the first embodiment is formed to be elongated in the sprocket width direction so as to be disposed only in the inner side of the neck portion 21b of the center boss portion 21.

Thereby, the appearance of the fastener element 20 viewed from the front and back sides of the chain cloth can be made closer to the appearance of the single-sided metal element. Further, in this case, the length of the upper end 41 of the base end surface 24a is also appropriately formed to a certain extent, so that the end portions of the first and second bulging portions 22 and 23 on the upper bottom 41 side are appropriately secured. Strength. Further, in the present invention, the pair of side edges 43 before and after the base end face 24a may be formed in a straight line instead of the curve as described above.

Further, as described above, the base end surface 24a of the trapezoidal shape is disposed only in the inner side of the neck portion 21b of the center boss portion 21, and the maximum value of the dimension in the sprocket width direction of the base end surface 24a is set to be smaller than The minimum value of the dimension of the neck portion 21b of the center boss portion 21 in the direction of the sprocket width.

Therefore, when the fastener element 20 is viewed from above in a plan view (see FIG. 3), the pair of side edges 43 are formed before the front end surface 24a of the trapezoidal shape, and the pair of side edges 43 are disposed before the front of the center boss portion 21. The position of the side surface enters the position inside the width direction of the element teeth. That is, the position of the front end side edge 43 of the base end surface 24a and the front side surface of the center boss portion 21 (particularly the leg portion of the center boss portion 21 and the front side surface of the engaging head portion 21c) are separated from each other.

By separating the front side edge 43 of the base end surface 24a from the front rear side surface of the center boss portion 21 in a plan view as described above, the front and rear side wall surfaces 25, 26 of the first bulging portion 22 can be self-drilled from the bulging end surface. 24 is inclined obliquely downward toward the side of the center boss portion 21. Thereby, the draft angle of the injection molding of the fastener element 20 can be stably provided in the front and rear side wall surfaces 25 and 26, and the mold release at the time of shaping can be performed smoothly.

Further, as shown in Fig. 7, the base end surface 24a of the trapezoidal shape has a base end side curved surface 45 which is from the lower base 42 (base end edge) of the base end surface 24a to the base width 41 (front end edge). The side of the upper side is inclined to be convex; the main base end surface 46 is continuously formed from the curved surface 45, and is substantially parallel or slightly curved in a convex shape with the front surface of the fastener fabric of the fastener chain 11; and the downward inclined surface 47 It is formed continuously from the main base end surface 46, and is inclined downward in a planar manner so that the thickness of the element is gradually reduced toward the upper end 41 (front end edge) in the chain width direction.

In this case, the base end side curved surface 45, the main base end surface 46, and the downward inclined surface 47 of the base end surface 24a are formed in parallel with respect to the fastener longitudinal direction of the fastener stringer 11, respectively. Further, the inclination angle of the inclined surface 47 of the lower surface of the base end surface 24a with respect to the fastener fabric surface of the fastener stringer 11 is set to 5 or more and 30 or less.

The base end surface 24a of the first embodiment has the lower inclined surface 47 as described above, whereby, as described below, even if the zipper 1 is subjected to the urging force or the like, a part of the zipper 1 is partially strongly bent in the front and back directions of the chain fabric. Further, it is also difficult to cause the fastener element 20 having the base end surface 24a to collide with the fastener element 20 of the meshing target, and even if the fastener element 20 collides with each other, the meshing state of the fastener element 20 is not easily separated. The power plays a role. Therefore, the occurrence of chain breakage can be effectively prevented.

Further, the front end portion of the base end surface 24a on the meshing head portion 21c side is lowered as described above. Tilting, for example, even when the slider 1 is subjected to a lateral pulling force or the like when the slider 30 is slid in the blocking direction, the fastener element 20 can be prevented from being caught in the slider 30 and the sliding of the slider 30 can be hindered. Thereby, the good slidability of the slider 30 can be stably maintained.

The projecting end surface 24b of the first bulging portion 22 protrudes forward from one of the front side edges of the pair of side edges before and after the base end surface 24a, and is formed in a region on the engaging head portion 21c. Further, the projecting end surface 24b has a shape in which the size of the longitudinal direction of the sprocket is gradually reduced toward the front, and the front end is thinner. In other words, when the projecting end surface 24b is viewed from the front and back sides of the fastener fabric, the projecting end surface 24b has a substantially triangular shape as a shape corresponding to the side edge shape of the self-engaging head portion 21c to the neck portion 21b. Further, in the present invention, the first bulging portion 22 may be formed such that the protruding end surface 24b protrudes rearward from one of the side edges of the rear end side of the base end surface 24a.

In this case, the longest side of the protruding end surface 24b extending in the width direction of the chain overlaps the side edge 43 of the base end surface 24a of the trapezoidal shape in the triangular projecting end surface 24b. Further, the side of the stalk front end side of the two sides extending obliquely forward from the base end surface 24a on the projecting end surface 24b is formed to be continuous with the bottom surface 41 of the base end surface 24a of the trapezoidal shape.

As shown in FIG. 6, the projecting end surface 24b is formed so as to descend from the base end surface 24a via the ridge line portion so as to gradually decrease the thickness of the element tooth toward the front side with respect to the base end surface 24a of the trapezoidal shape parallel to the longitudinal direction of the fastener fabric. Inclined flat slope. In this case, the projecting end surface 24b is inclined with respect to the base end surface 24a or the front surface of the fastener fabric. The angle of inclination of the protruding end surface 24b with respect to the front surface of the fastener fabric 11 (the inclination angle of the inner corner side) is preferably set to 45 or less, and particularly preferably set to 20 or more and 45 or less. In particular, in the first embodiment, the projecting end surface 24b is inclined downward from the base end surface 24a toward the longitudinal direction of the chain so that the inclination angle with respect to the front surface of the fastener fabric 11 is 40°.

The protruding end surface 24b of the first embodiment is inclined with respect to the base end surface 24a or the front surface of the fastener fabric 11 as described above, whereby even a part of the zipper 1 is chained as follows. The front and back directions are partially strongly bent, and it is also possible to more effectively prevent the zipper element from being held in a state in which the tilting abnormal posture is maintained or the chain is broken as described below.

Further, the projecting end surface 24b is formed in a flat surface instead of a concave surface. Therefore, when the fastener element 20 is viewed from the upper side, the triangular projection end surface 24b of the first bulging portion 22 can be formed in the same manner as the base end surface 24a of the trapezoidal shape. In order to be easy to see, it is easy to protrude the end face 24b so that the light is reflected toward the front and back sides of the chain cloth. Therefore, the shape of the bulging end surface 24 including the base end surface 24a and the projecting end surface 24b can be made as beautiful as a single-sided metal sprocket.

The front side wall surface 25 and the rear side wall surface 26 of the first bulging portion 22 are disposed from the bulging end surface 24 to the side surface of the center boss portion 21 so as to face the longitudinal direction of the fastener fabric, and are disposed at the boundary of the bulging end surface 24. A ridge portion is formed at a boundary portion between the portion and the center boss portion 21, respectively.

In particular, in this case, the front side wall surface 25 is convex toward the center from the side edge of the triangular-shaped projecting end surface 24b and the portion other than the front end portion of the front side edge portion 43a of the ladder-shaped base end surface 24a except the protruding end surface 24b. The table portion 21 is formed to be inclined downward toward the front.

The rear side wall surface 26 is formed to be inclined downward toward the center boss portion 21 from the rear side edge 43 of the base end surface 24a of the trapezoidal shape. The inclined surfaces (wedge surfaces) of the front and rear side wall faces 25, 26 are formed so as to be inclined at an angle of more than 45 with respect to the front side of the fastener fabric, and as the fastener elements 20 as described above. It functions as a draft angle at the time of injection molding.

Further, the front side wall surface 25 and the rear side wall surface 26 of the first bulging portion 22 have a curved surface (concave surface) that is curved in a concave shape so as to be recessed toward the inside of the fastener element 20. When the first side wall surface 25 and the rear side wall surface 26 of the first bulging portion 22 are formed in a concave shape as described above, when the first bulging portion 22 is viewed from the upper surface side, it is difficult to see the front side wall surface 25 and the rear side wall surface. 26.

Further, the light reflecting direction is changed by the concave surfaces disposed on the front side wall surface 25 and the rear side wall surface 26, and the light is hard to be sprocketed by the front side wall surface 25 and the rear side wall surface 26 of the first bulging portion 22. Scattered on the upper side. As a result, the front side wall of the first bulging portion 22 The face 25 and the rear side wall surface 26 appear to be darker than the bulging end face 24 as a shadow.

Therefore, in the fastener element 20 of the first embodiment, the base end surface 24a of the trapezoidal shape of the bulging end surface 24 of the first bulging portion 22 looks bright by the contrast with the front side wall surface 25 and the rear side wall surface 26. And slender. Further, the protruding end surface 24b can be easily seen by making the inclination angle of the protruding end surface 24b smaller than the inclination angle of the rear side wall surface 26 of the front end portion of the base end surface 24a opposite to the protruding end surface 24b. Further, by forming the rear side wall surface 26 on the opposite side to the protruding end surface 24b into a concave shape to appear dark, the presence of the protruding end surface 24b can be more clearly recognized and displayed. Thereby, the bulging end surface 24 of the first bulging portion 22 can be made more effectively like a single-sided metal sprocket.

Further, in the first embodiment, the neck portion 21b of the center boss portion 21 has a shape that is relatively narrowed in the direction of the sprocket width, and the position of the rear side edge 43 before the base end face 24a in plan view and the neck portion are provided. The position of the front side and the rear side of the 21b is close to each other. Further, the triangular-shaped projecting end surface 24b protrudes forward from the base end surface 24a to the vicinity of the front side surface of the engaging head portion 21c, and the position of the projecting front end edge of the projecting end surface 24b in plan view is close to the position of the front side surface of the engaging head portion 21c. And configuration. Therefore, each of the narrower front side wall portion, the rear side wall portion, and the side wall portion of the protruding end surface 24b may be formed as a concave curved surface having a small curvature or a concave curved surface close to a plane, or The inclined angle of the front side of the chain fabric of the zipper chain cloth 11 is close to a plane of 90°.

As described above, the second bulging portion 23 of the fastener element 20 of the first embodiment has a front and back with respect to the first bulging portion 22 with respect to the reference surface of the fastener chain 11 at the center in the thickness direction of the fastener fabric. Symmetrical form. By forming the first bulging portion 22 and the second bulging portion 23 in a plane symmetrical manner with respect to the fastener chain 11 as described above, the second bulging portion 23 of the fastener element 20 can be exposed to the outside. The zipper 1 is constructed in such a manner that the face side is revealed.

In the slide fastener 1 of the first embodiment, as described above, the synthetic resin fastener element 20 has the bulging end surface 24 formed by the base end surface 24a of the trapezoidal shape and the protruding end surface 24b of the triangular shape. When the zipper element 20 is viewed in the forward and reverse directions, it is close to the first The appearance of the single single-sided metal sprocket.

Therefore, in the zipper 1 of the first embodiment, each of the zipper elements 20 can give an impression of being fashionable as a single-sided metal sprocket in the width direction of the chain cloth, or an attractive impression, so that the appearance quality or design is excellent. And is lighter than previous zippers with single-sided metal sprocket.

Further, even if each of the fastener element teeth 20 has an elongated shape in the width direction of the chain as a single-sided metal element, it is possible to form the base end faces 24a in a trapezoidal shape so as to be adjacent to each other in the longitudinal direction of the chain fabric. The interval d between the base end portions of the base end faces 24a of the fastener elements 20 is small (refer to Fig. 9). Therefore, for example, even if the slider 30 is slid in the blocking direction while the zipper 1 is strongly biased, the flange portion of the slider 30 can be prevented from entering between the fastener elements 20, thereby ensuring stable stability. The slider 30 slides smoothly.

Further, in the slide fastener 1 of the first embodiment, as described above, at least the meshing head portion 21c of the first bulging portion 22 of each of the fastener element teeth 20 and the base end surface 24a of the second bulging portion 23 has The inclined surface 47 is inclined downward to the bottom 41, and the protruding end faces 24b of the first bulging portion 22 and the second bulging portion 23 are formed to be inclined downward from the base end surface 24a.

As a result, for example, as shown in FIG. 10, the first and second bulging portions 22 and 23 of the respective fastener elements 20 can be engaged in a state in which the respective fastener elements 20 fixed to the left and right fastener tapes 11 are engaged with each other. The height position of the fastener stringer 11 at the front end portion is lower than the height position of the portion corresponding to the neck portion 21b of the first and second bulging portions 22, 23 of the fastener element 20' on the meshing target side. In addition, in FIGS. 10 and 11, in order to explain the engagement of the fastener element 20 in an easy-to-understand manner, one of the left and right fastener elements 20 is indicated by the symbol "20", and the other is engaged. The zipper element of the object is represented by the symbol "20'".

Further, the protruding end faces 24b of the first and second bulging portions 22 and 23 of the fastener element 20 and the first and second bulging portions 22 and 23 of the fastener element 20' on the meshing target side can be opposed to each other. Thereafter, the interval between the side wall faces 26 widens as the self-zipper chain 11 exits. Further, in this case, the protruding end faces 24b of the first and second bulging portions 22 and 23 and the first and second drums can be largely ensured. The angle θ formed by the side wall surface 25 of the front portion 22, 23.

As a result, for example, as shown in FIG. 10, the slide fastener 1 of the first embodiment is swelled to the second of the fastener elements 20 and 20' by the jacking force or the like in a state in which the left and right fastener elements 20 and 20' are engaged. When the portions 23 are partially bent in a direction close to each other to a small radius of curvature, it is difficult to cause defects such as chain breakage. This effect will be specifically described below.

Here, it is assumed that, for example, the downstream inclined surface 47 is not provided at the end portion of the base end surface 24a of the first bulging portion 22 and the second bulging portion 23, and the protruding end surface 24b protrudes in parallel with the base end surface 24a from the base end surface 24a. In this case, the angle θ formed by the protruding end surface 24b of the first and second bulging portions 22 and 23 and the front side wall surface 25 of the first and second bulging portions 22 and 23 is smaller than that of the first embodiment. situation).

In this case, when the zipper 1 is partially bent in a direction in which the second bulging portions 23 of the left and right fastener elements 20 and 20' are close to each other when the zipper 1 is subjected to a lifting force or the like, the zipper 1 is bent to as shown in FIG. Before the smaller radius of curvature is shown, the second bulging portion 23 of the fastener element 20 collides with the second bulging portion 23 of the fastener element 20' on the meshing target side to interfere with each other. Thereafter, when the zipper 1 is bent to a smaller radius of curvature as shown in FIG. 11, there is a case where a portion where the fastener elements 20, 20' interfere with each other becomes a fulcrum and the left and right zipper elements 20, 20' (In particular, the center boss portion 21) is rotated in a direction in which the zipper elements 20, 20' are inclined in the forward and reverse directions of the chain cloth or the longitudinal direction of the chain cloth. As a result, there is a problem that, for example, the zipper element 20' is sandwiched between the fastener elements 20 of the engaging object in a state of maintaining the abnormal posture of the tilt without returning to the original normal posture, thereby hindering the sliding of the slider 30; In the worst case, the meshing of the center boss portions 21 of the left and right fastener elements 20, 20' is separated, thereby causing the chain to break.

On the other hand, in the slide fastener 1 of the first embodiment, the front end portion of the front end portion 24a is inclined and the lower end portion of the projecting end surface 24b is inclined, whereby the front end of the second bulging portion 23 of the fastener element 20 can be lowered. The height of the zipper chain 11 from the portion, and as described above, the protruding end surface 24b of the second bulging portion 23 and the fastener element 20' of the engaging object side are secured. The interval is wider. At the same time, the angle θ formed by the protruding end faces 24b of the first and second bulging portions 22 and 23 and the front side wall faces 25 of the first and second bulging portions 22 and 23 can be increased.

Thereby, when the zipper 1 is partially bent to a small radius of curvature, the second bulging portion 23 of the fastener element 20 and the second bulging portion 23 of the fastener element 20' on the meshing target side are hardly collided. Further, as shown in FIG. 11, even if the second bulging portion 23 of the fastener element 20 collides with the second bulging portion 23 of the fastener element 20' on the meshing target side, it is difficult to make the second zipper element 20 The bulging portion 23 acts to press the fastener element 20' on the meshing target side in a direction in which the meshing state is separated, and it is possible to suppress the posture of the fastener element 20' from being largely inclined.

Thereby, the fastener element 20' can be prevented from being held in an abnormal posture as described above, so that the meshing state of the left and right fastener elements 20, 20' can be stably maintained, and the chain breakage can be effectively prevented. Therefore, the slide fastener 1 of the first embodiment is a high-quality slide fastener 1 which is less likely to cause chain breakage and stably maintain the zipper function.

Further, as described above, the first bulging portion 22 and the second bulging portion 23 of the fastener element 20 of the first embodiment are centered on the reference surface of the fastener chain 11 at the center in the thickness direction of the fastener fabric. They form an opposition to each other. However, the fastener element of the present invention is not limited thereto, and for example, as shown in the fastener element 20a of the modification of the embodiment 1 of Fig. 12, the respective bulging end faces of the first and second bulging portions 22, 23a Each of the 24th base end faces 24a and the triangular projecting end faces 24b may be formed such that the first bulging portion 22 and the second bulging portion 23a are asymmetrically formed in the front and back directions of the chain cloth.

In the fastener element 20a of the modification, the second bulging portion 23a is located in the center of the sprocket width direction (the longitudinal direction of the chain) with respect to the second bulging portion 23 of the fastener element 20 of the first embodiment. The reference surface in the direction of the sprocket width is formed so as to have an opposite direction to the front and rear. In this case, the center boss portion 21 and the first bulging portion 22 of the fastener element 20a of the modified example are formed in the same manner as the center boss portion 21 and the first bulging portion 22 of the fastener element 20 of the first embodiment. .

That is, the second bulging portion 23a of the modified example is a fastener chain 11 with respect to the first bulging portion 22. The reference surface located at the center of the thickness direction of the link fabric is formed symmetrically in the vertical direction (the front and back directions of the chain cloth), and is oriented in the front-rear direction centering on the reference plane located at the center in the longitudinal direction of the chain fabric ( The longitudinal direction of the chain fabric is formed symmetrically.

Even in the case where the plurality of fastener elements 20a having the form of such a modification are fixed to the fastener zipper at the side edge portion of the fastener chain 11, the same effect as that of the slide fastener 1 of the first embodiment can be obtained.

Example 2

Fig. 13 is a perspective view showing the fastener element of the second embodiment, and Fig. 14 is a bottom view of the fastener element. Figure 15 is a schematic view showing the fastener element when viewed from the meshing head side of the center boss portion in the width direction of the chain fabric, and Figure 16 is the fastener chain viewed from the leg side of the center boss portion in the width direction of the chain cloth. Pattern diagram of the tooth.

Further, the slide fastener element 50 of the second embodiment described below has the main features, and the components or members other than the fastener element 50 have substantially the same configuration as the slide fastener 1 of the first embodiment. Therefore, in the second embodiment, the configuration of the fastener element 50 will be mainly described, and a detailed description of the components or members other than the fastener element 50 will be omitted.

The zipper according to the second embodiment has a pair of right and left fastener tapes which are formed with the fastener element side edges of the right and left fastener chain fabrics 11 and are arranged adjacent to the fastener element rows at the front ends of the respective fastener tapes. a first stop, a separable insert disposed at an end of the pair of links, and a slider slidably disposed along the chain of teeth.

Each of the fastener element teeth 50 of the second embodiment has a central boss portion 51 disposed at a central portion in the thickness direction of the sprocket, and a first bulging portion (front side bulging portion) that bulges upward from the center boss portion 51. 52. A second bulging portion (back side bulging portion) 53 that bulges downward from the center boss portion 51.

The first bulging portion 52 and the second bulging portion 53 of the second embodiment have the same shape as the first bulging portion 22 and the second bulging portion 23 of the first embodiment, and the tip end of the bulging end surface 54 The protruding end surface 54b of the thin shape (triangular shape) protrudes forward from the base end surface 54a of the trapezoidal shape.

However, in the center boss portion 51 of the second embodiment, the first half portion 61 and the second half portion 62 described later are formed at positions shifted from each other in the longitudinal direction of the chain (the sprocket width direction), and thus The first bulging portion 52 bulged by the first half portion 61 of the center boss portion 51 is disposed along the length of the chain cloth together with the second bulging portion 53 bulged from the second half portion 62 of the center boss portion 51. The position in which the directions (the direction of the sprocket width) are shifted from each other.

The center boss portion 51 of the second embodiment has the first half portion 61 disposed on the front side of the chain fabric at a reference surface of the fastener chain 11 in the center in the thickness direction of the fastener fabric, and is disposed on the front surface of the fastener fabric. The second half 62 on the back side of the chain cloth. In this case, the center boss portion 51 is fixed across the front surface of the fastener fabric 11 and the back surface of the fastener fabric, but the first half portion 61 and the second half portion 62 are in the longitudinal direction of the fastener fabric (the direction of the sprocket width). Configured with each other in a staggered position.

The first half portion 61 of the center boss portion 51 has a main body portion 61a fixed to the chain side edge portion of the fastener chain cloth 11, and a neck portion 61b extending from the main body portion 61a toward the outer side of the chain fabric in the chain width direction. And an engaging head portion 61c extending from the neck portion 61b and further in the width direction of the chain cloth, and not provided with a shoulder portion 21d protruding from the neck portion 21b in the above-described first embodiment or recessed at the end portion before the engaging head portion 21c The groove portion 21e.

Further, similarly to the first half 61, the second half portion 62 of the center boss portion 51 has a main body portion 62a fixed to the side edge portion of the fastener fabric 11 and is attached to the outer side of the chain from the main body portion 62a. The neck portion 62b extending in the width direction of the chain cloth and the engaging head portion 62c extending from the neck portion 62b and further in the width direction of the chain cloth are not provided with the shoulder portion 21d or the groove portion 21e of the above-described first embodiment.

The center boss portion 51 of the first and second half portions 61 and 62 having such a shape is provided with the engaging head portions 61c and 62c and the neck portions 61b and 62b in the first and second half portions 61 and 62, respectively. When the slider is slid and the zipper is opened and closed, the left and right fastener elements 50 can be smoothly engaged and disengaged, and the transverse tension applied to the width direction of the chain can be stably stabilized to ensure sufficient strength (horizontal pull) Stretching strength).

Further, in the center boss portion 51 of the second embodiment, the first embodiment is not formed as described above. When the shoulder portion 21d or the groove portion 21e is formed, the position of the first half portion 61 and the position of the second half portion 62 are shifted in the longitudinal direction of the chain cloth, and when the left and right fastener elements 50 are engaged. One of the first half 61 (or the second half 62) of each of the fastener elements 50 and one of the second half 62 (or the first half 61) of the fastener element 50 of the meshing element are partially attached to the chain. Overlap in the opposite direction. Therefore, the sufficient strength (the jacking strength) for durability can be stably ensured against the jacking force applied in the forward and reverse directions of the chain cloth.

Further, the fastener element 50 of the second embodiment is formed such that the fastener element 20 of the first embodiment is not symmetrically formed on the front side of the fastener fabric and the back side of the fastener fabric. Therefore, compared with the slide fastener 1 of the first embodiment, It is inferior in terms of the beauty of the zipper element 50 or the slidability of the slider.

However, in the center boss portion 51 of the second embodiment, since the shoulder portion 21d or the groove portion 21e is not formed as described above, the fastener element 50 of the second embodiment is used for the injection molding die in the chain cloth. When it is opened in the opposite direction, it becomes a shape without an undercut. Therefore, since the core (slider core) is not required for the injection molding of the fastener element 50, for example, the injection molding can be performed more easily and efficiently than the fastener element 20 of the above-described first embodiment.

Further, in the second embodiment, for example, when the two sliders of the first slider and the second slider are attached to the element rows in opposite directions to form a slide fastener, the two sliders are not caused to cause two slips. The operability of the slider between the parts is poor.

Even in the zipper of the second embodiment in which the plurality of fastener element 50 having the above-described form is fixed to the side edge portion of the fastener fabric of the fastener chain 11, the same effect as that of the slide fastener 1 of the above-described first embodiment can be obtained. .

Further, as described above, the first bulging portion 52 and the second bulging portion 53 of the fastener element 50 of the second embodiment are the same as the first bulging portion 22 and the second bulging portion 23 of the first embodiment. In the same manner, the protruding end face 54b having a tapered shape is provided. The tapered projecting end surface 54b has a triangular shape which gradually tapers from the base end surface 54a toward the front side as the protruding direction. In the second embodiment, the projecting end surface 54b protrudes only forward from the base end surface 54a of the trapezoidal shape. The way it is formed.

However, the fastener element of the present invention is not limited thereto. For example, the fastener element 50a according to the modification of the second embodiment shown in Fig. 18 may be fixed to the fastener chain cloth 11 to form a slide fastener.

Specifically, in the fastener element 50a according to the modification of the second embodiment, the first bulging portion 52 on the front side of the chain fabric has a triangular-shaped projecting end surface 54b of the bulging end surface 54 from the trapezoidal shape. The base end surface 54a is formed to protrude only forward, and is formed in the same manner as the first bulging portion 52 of the above-described second embodiment shown in FIGS. 13 to 17 .

On the other hand, the second bulging portion 53a on the back side of the chain fabric is formed such that the triangular projecting end surface 54b of the bulging end surface 54 protrudes only rearward from the base end surface 54a of the ladder shape, and is opposed to the first drum. The outlet portion 52 is on the opposite side of the longitudinal direction of the chain fabric.

In addition, the first bulging portion 52 on the front side of the chain fabric and the second bulging portion 53a on the back side of the chain fabric are shifted from each other in the longitudinal direction of the chain (the sprocket width direction) so that the first drum is provided. The zipper of the fastener element 50a of the variation of the second bulging portion 53a facing the opposite direction of the second bulging portion 53a in the longitudinal direction of the chain (the sprocket width direction) can also be obtained from the above embodiment. The zipper 1 of 1 or the zipper of the embodiment 2 has the same effect.

20‧‧‧zipper teeth

21‧‧‧Central Boss Department

21a‧‧‧ Main body

21b‧‧‧ neck

21c‧‧‧ meshing head

21d‧‧‧Shoulder

21e‧‧‧ Groove

22‧‧‧1st bulging (front side bulging)

23‧‧‧2nd bulging part (back side bulging)

24‧‧‧ bulging end face

24a‧‧‧Base end face

24b‧‧‧Outstanding end face

26‧‧‧ Rear side wall

27‧‧‧ front end

Claims (12)

A fastener element for zipper fasteners (20, 20a, 50, 50a) of a synthetic resin zipper (1) which is formed by a synthetic resin zipper (1) at a side edge portion of a fastener fabric (11) and has a fixing to the above The central boss portion (21, 51) on the fastener chain cloth (11) and the first side of the chain cloth in the thickness direction of the fastener element and the back side of the chain cloth from the center boss portion (21, 51) And the second bulging portion (22, 52; 23, 23a, 53, 53a), wherein the central boss portion (21, 51) has a specific size in the sprocket width direction and is fixed to the zipper chain cloth (11) The upper body portion (21a, 61a, 62a), the neck portion (21b, 61b, 62b) extending from the main body portion (21a, 61a, 62a) toward the outer side of the chain longitudinal direction of the fastener element, and the above The neck portion (21b, 61b, 62b) is an engaging head portion (21c, 61c, 62c) extending in the longitudinal direction of the sprocket; the zipper element is characterized by: the first and second bulging portions (22, 52) ; 23, 23a, 53, 53a) respectively have a bulging end surface (24, 54) facing upward or downward in the thickness direction of the sprocket, and a front side edge (43) from the bulging end surface (24, 54) to the above Formed by the central boss (21, 51) In the front and rear side wall faces (25, 26), the bulging end faces (24, 54) are provided with base end faces (24a, 54a) having a rectangular shape which is long in the longitudinal direction of the sprocket, which is engaged with the above-mentioned meshing head (21c, 61c, 62c) side front end edge (41), base end edge (42) on the main body portion (21a, 61a, 62a) side, and both ends of the front end edge (41) and the base end edge One side of the pair of (42) is connected to the side edge (43) as four sides; and the protruding end faces (24b, 54b) are formed from the pair of side edges (24a, 54a) before and after the side edge (43) Only one of the side edges (43) protrudes in the sprocket width direction; the protruding end faces (24b, 54b) are formed on the engaging heads (21c, 61c, 62c) and have faces from the base end face (24a, 54a) The shape in which the front end is tapered and the front end is tapered. A fastener element according to claim 1, wherein said base end surface (24a, 54a) has a trapezoidal shape, said trapezoidal shape having said front end edge (41) as an upper base and said base end edge (42) as a lower base A pair of the side edges (43) are used as a pair of side edges, and the lower bottom (42) is formed to be longer than the upper base (41). The fastener element of claim 2, wherein the length of the lower base (42) is set to be 1.2 times or less the length of the upper base (41). The fastener element of claim 2 or 3, wherein the pair of said side end faces (43) of the base end faces (24a, 54a) are formed to be curved inwardly in a concave shape. The fastener element according to any one of claims 1 to 3, wherein the protruding end faces (24b, 54b) are inclined downward from the base end faces (24a, 54a) in the sprocket width direction. The fastener element according to any one of claims 1 to 3, wherein the base end surface (24a, 54a) has an inclined surface (47) which is inclined downward in the longitudinal direction of the fastener element toward the front end edge. The fastener element according to any one of claims 1 to 3, wherein said base end surface (24a, 54a) is disposed only in said sprocket width direction of said neck portion (21b) of said central boss portion (21, 51) , 61b, 62b) The area on the inside. The fastener element according to any one of claims 1 to 3, wherein the protruding end surface (24b, 54b) is formed as a curved surface of a plane or a ridge, and at least the protruding end surface of the side wall surface (25, 26) 24b, 54b) A portion which is disposed on the opposite side with respect to the base end surface (24a, 54a) is inclined downward toward the center boss portion (21, 51), and is formed as a curved surface of the concave strip. The zipper element according to any one of claims 1 to 3, wherein the central boss portion (21) further has a shoulder portion (21d) extending from the neck portion (21b) in the sprocket width direction, and a concave portion The groove portion (21e) provided at the end portion of the engaging head portion (21c) is formed antisymmetrically centering on the reference surface of the fastener stringer (11) at the center in the thickness direction of the chain fabric. The fastener element according to any one of claims 1 to 3, wherein the central boss portion (51) has a chain cloth disposed on a reference surface of the fastener chain cloth (11) at a center in a thickness direction of the chain fabric. a first half (61) on the front side and a second half (62) disposed on the back side of the chain from the reference surface, the first half (61) and the second half (62) They are arranged in a staggered position in the direction of the sprocket width. A chain belt, characterized in that a plurality of the above-mentioned fastener elements (20, 20a, 50, 50a) according to any one of claims 1 to 10 are fixed to a side edge portion of a chain fabric of the above-mentioned fastener chain cloth (11) . A zipper characterized by having the chain of the chain (10) as claimed in item 11 and the sprocket (12) mounted on a chain of teeth (12) comprising a plurality of said fastener elements (20, 20a, 50, 50a) Piece (30).